Mold-forming apparatus



A. S. SHHVION.

MOLD FORMING APPARATUS.

APPLICATION FILED IA;I.27 I921.

,434,508. I v Patented Nov. 7, 1922.

4 SHEETSSHEET l.

A. S. SHIMON.

MOLD FORMING APPARATUS.

APPLICATION FILED JAN.27, 1921.

1,434,508. Patented Nov. 7 1922.

4 SHEETS-SHEEI 2.

a w E Z6 5 I E 9 2 22 9 1/4? H fl 3 Q I I I 2% A. S. SHIMON.

MOLD FORMING APPARATUS.

APPLlCATION FILED JAN.271 1921.

Patented Nov. 7 1922.

4 sHEETs-sHEEI 3.

A. S. SHIMON.

MOLD FORMING APPARATUS.

APPLlCATlON FILED JAN. 27, IBZI.

Patented. Nov. 7, 1922.

Patented Nov. 7, 1922.

FATE NT 0 ALBERT S. SH'IMON, OF CHARDON, OHIO.

Mono-FORMING APPARATUS.

Application filed January 27,1921. Serial No. 440,410.

T 0 aZZ whom "it may concern.

Be it known that I, ALBERT S. SHIMON, a citizen of the United States,residing at Chardon, in the county of Geauga and State of Ohio, haveinvented certain new and useiiul Improvements in a Mold-F0rmingApparatus; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

The object of the invention is to provide mechanism for accuratelypositioning sand and mold facing material in the formation of molds toproduce the necessary hardness or compactness thereof without being toohard, regardless of the irregularities or complex'ities of the outlineof the pattern, without involving the work, time and skill necessary inthe ramming of the mold under the present approved practice, so that theformation of the moldmay be accomplished by unskilled labor with anaccuracy which is unattainable except under the most favorableconditions even by skilled labor in accordance with the present methods,owing to the fact that the sand is introduced into the mold box undersuch conditions as to find its way into each angle, crevice and cornerof the pattern and is compacted as it is introduced under a uniformpressure so that the mass of the mold when completed is of uniformconsistency; and with these objects in view the invention consists in aconstruction and combination of parts of which a preferred embodiment isshown in the drawings, wherein:

Figure 1 is a general view of the apparatus.

FigureQ is a vertical sectional view of the sand vbox showing the coverthereof in an inclined or screening position.

.Eigure 3 *is an enlarged view partly :in section of the sand conveyorand related parts. t

Figure 4 is a similar view of amodilied form of the conveyor branched toprovide for depositing sand and facing material alternatively in themold box.

Figure 5 is a detail transverse section on the :plane indicated by theline 55 of Fig :ure 3.

Figure 6 is a sectional view on the plane ndicated by the line 6-6 ofFigure 4..

Figures 7 and 8 are detail sectional views respectively on the planesindicated by the lines 77 'and 8-8 of Figure 6.

Figures 9 and 10 are sections on the lines 9+9 and l010 of Figure 2,respectively.

The apparatus consists essentially of a conveyor 10, having a deliverynozzle ll, preferably of elbow or curved form as incliicateld connectedby a flexible section 12 of hose or like material with a feed nozzle 13,the flexible section beingjointed or coupled as indicated at 14: and 15respectively with the delivery and feed nozzles, and the feed nozzlebeing in communication with the supply box or reservoir 16 for sand orsimilar molding material, it being understood that when the device is inthe form suggested in Figure d where sand and facing material may besupplied alternatively, a similar supply box or hopper 'for the facingmaterial may be employed, but .as the construction thereof preferably isthe same as that embodied in .the sand box, the detailed illustration ofthe shafts l8 and 1-9 carrying arms 20 and 21 designed to loosen thecontents of the box and insure the free feeding thereof to the conveyor.The ends of these agitator shafts are provided with sprocket wheels 22and 23 traversed by a chain 24, and one of the shafts, preferably thatof the lower agitator as shown vin the drawing is provided with a crankarm 25 connected with the piston rod 26 of a cylinder 27 to which air orother motive agent under pressure may be admitted :;through the feedpipe .28 controlled by valve 29, to the end that when pressure issupplied the piston 30 in said cylinder will be reciprocated tooscillate .theagitators and thus loosen .the contents of the box.

Located in the delivery and feed nozzles .11 and 13 are injector nozzles30 and 31. A Y -shaped coupling 30fcommunicates with the nozzle .30, anda similar coupling 31 vthe pressure conductor 33 communicates with thenozzle 31, as clearly shown in figures 1 and 3 of the drawings. Aconductor 32, which is preferably of the flexible type, is adapted to bedetachably connected to any one of the feed valves 32 of a pipe 32*forming a part of a compressed air supply system of that type to befound in the average foundry. This conductor 32 is connected to one ofthe branches of the coupling 30 to supply the nozzle 30 with compressedair, and a similar conductor 33 leads from the other branch of thiscoupling to one of the branches of the coupling 31 to supply the nozzle31 with compressed air. The conductor 28 which supplies the motor withcompressed air is connected to the other branch of the coupling 31%Needle valves 37 and 38 are disposed to regulate the discharge throughthe injector nozzles which respectively serve to drive the sand or othermaterial through the nozzles and hence through the portion of theconveyor repre sented by the flexible section 12, the latter beingemployed to permit of the free move ment of the delivery nozzle inapplying the sand to the mold box or to the surface of the patternlocated therein. A regulating and cut off valve 39 is employed inconnection with the pressure supply pipe 36 to regulate the supply ofpressure to the conductor members 32 and 33, and obviously by theadjustment of the needle valves 37 and 38 an effective discharge throughthe injector nozzles may be provided to insure the proper progress of.the material from the reservoir through the conveyor and from the latterthrough the delivery nozzle to the mold box. The force with which thesand is projected from the delivery nozzle causes it to search out anddeposit in the smaller anglesand crevices of the pattern. and inasmuchas this force can be regulated it is possible to pack the sand as it isthus delivered to the mold box so that when the latter has become filledthere a uniformity of compactness of material constituting the moldwhich is conductive to the preparation of satisfactory castings whichtruthfully represent the pattern. Y

As indicated in Figure 4c, the conveyor may be branched, as indicated at12 and 12 a common delivery nozzle 11 being employed and the feed nozzlebeing similarly duplicated as indicatedat 13" and 13 with the relatedparts constructed and arranged substantially as above described exceptthat is similarly branched as shown at 33 and 33 and are connected withthe supply by means of a switch valve 40 which is of the two-way varietyadapted to supply pressure to either of the ejector nozzles of the feednozzles 13" and 1.3", the branches 33 and 33 having bypass connections28 and 28 fonsupplying pressure medium respectively to the cylinderswhich serve to operate the agitators respectively of the sand and facingmaterial boxes or reservoirs.

The sand box is preferably provided with a screen cover 41 adapted to bearranged in an inclined position to permit of screening the sand as itis shoveled thereinto, and for this purpose being provided with a rack4L3 by which it may be held at the desired inclination.

From the above description it will be obvious that by means of theapparatus it is possible to convey the sand or molding material from theplace of supply to the mold box and to uniformly deposit the same withreference to the pattern located in the box under conditions insuring aproper formation of the mold without effort upon the part of theoperator and without the 'loss of time incident to the ramming orcompasting of the mold as in accordance with the present method, andthat furthermore as the sand or other material is deposited a uniformcompacting thereof is effected so as to insure a uniformity of solidityin the mold when completed which is ordinarily unattainable when thesand is packed as in the ordinary way. Moreover in the event that avariation in the firmness of the mold is desired it can be securedmerely by a modification in the adjustment of the injector valyes, asfor example when it is desired to provide a relatively harder surfacefor the iold' hen the body portion thereof or vice versa.

In the preferred embodiment of the inveution the pressure supply pipe 32is pri- 'marily connected with the in ector nozzle 30 in the deliverynozzle, and pressure is then communicated to the injector nozzle 31 inthe feed nozzle through a branch 33, so that a more or less reducedpressure is applied to the second named nozzle, not particularly for thepurpose of reducing the pressure so far 'as the feed nozzle is con ernedbut especially to insure the maximum pressure at the delivery nozzle toprovide for conducting the material through the delivery p1pe under suchconditions as to avoid clogging or in other words to provide for thedelivery of the material at least as rapidly as it can be supplied bythe injector mechanism of the feed nozzle, and adjacent to thefeed'nozzle the supply pipe for the air pressure is further branched asindicated at 28 to supply the motor by which the agitators are operated,a still further reduced pressure being sufficient for this purpose andpermitting of the effective use of a common means of communicatingpressure from the source of supply to the mechanism. Thus in practicethe pressure from the source of supply is presented in a relativelygraduated degree respectively to the delivery and feed nozzle and to themotor, with the maximum pressure applied to the injector nozzle in thedelivery nozzle. Moreover as will be noted the pressure in the supplypipe is directed toward the injector nozzle in the delivery nozzle whilethe branch pipe 33 in effect rereives the back pressure incident to anyresistance which may be offered to the column of air in its dischargefrom the nozzle 30, and to increase the relative pressure of the feednozzle it is only necessary to increase the resistance at the injector30 by the adjustment of the needle valve 3'7. Thus a relativeapplication of pressure at the two nozzles to secure an effective jointoperation thereof may be readily attained. to provide an effectivesupply of the material to the mold box.

In the form of the device illustrated in Figures &, 6, 7 and 8 theswitch valve or gate 40 is preferably of a split or double winged typeas indicated clearly in Figure 7 and the stem or spindle l8 thereofpreferably carries a two way valve l l which controls the flow of airpressure respectively through the branch pipes 3-3 and 33 by which saidpressure is conveyed alternately to the injector nozzles in the feednozzles 13 and 13 of the double form of apparatus. Thus by theadjustment of the switch valve or gage by means of the handle 45connected with said stem 43, the two way valve 41% is simultaneouslyadjusted to switch the pressure from the air supply to the proper :t'eednozzle as the gate is reversed. The double or winged form of gateadapted to effectively close the branches of the conveyor as and by amotion suiiicientto reverse the position of the valve 4:4:- Thus asingle operation sufficient to bring the parts into posit-ion to supplyeither sand or facing material.

Having thus described the invention, what I claim is:-

l. An apparatus for the purpose described having a reservoir for moldingmaterial, a conveyor having a Feed nozzle in communication with thereservoir and a delivery nozzle in communication through an intermediateflexible section with. the feed nozzle. injector nozzles arrangedrespectively in said feed and delivery nozzles and in communication witha source of fluid under pressure,.

said. injector nozzles being provided with regulating valves, and meansfor delivering the material from the reservoir to said feed nozzle, andconsisting of agitators and pressure controlled means for actuating thesame.

2. A mold. forming apparatus having a feed box, a conveyor incommunication with the teed box and provided with a delivery nozzle, anector nozzle located in the delivery nozzle and provided with aregulating valve, a conductor in communication with said inject-ornozzle and leading from a source of fluid under pressure, agitatorsarranged in said feed box, a pump cylinder having its piston operativelyconnected with said agitators and a valve connection between saidcylinder and the conductor which supplies the injector nozzle.

3. A. mold forming apparatus having areservoir tor molding material, aconveyor having feed and delivery nozzles of which the former is incommunication with the res ervoir, an agitator in the reservoir, :1motor for actuating said agitator, injector nozzles respectively in saidfeed and delivery nozzles, and a pressure supply conductor incommunication with a source 01 supply and in direct communication withthe delivery injector nozzle, a branch conductor ext-ending from saidsupply conductor adjacent to the delivery injector nozzle to the feed injector nozzle and a second branch extending :lrom the first namedbranch, a. point near the feed injector nozzle to the motor.

t. in an apparatus of the class described a reservoir, spaced feed anddelivery nozzles, a flexible tubular conductor joining said nozzles,agitators in said reservoir, a fluid pressure motor tor actuating saidagitators, injectors for each of said nozzles. and a source ct fluidunder pressure common to the injectors and the motor.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT S. SHIMON.

Witnesses V. G. SAMPsoN, CHAS. De HENNING.

